Three extinct squirrel-like species discovered: Mammals may have originated much earlier than thought

10 septiembre 2014

Paleontologists have described three new small squirrel-like species that place a poorly understood Mesozoic group of animals firmly in the mammal family tree. The study supports the idea that mammals — an extremely diverse group that includes egg-laying monotremes such as the platypus, marsupials such as the opossum, and placentals like humans and whales — originated at least 208 million years ago in the late Triassic, much earlier than some previous research suggests.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/RhzNjMzcZRU/140910132522.htm

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